Aryl n-methyl substituted thionocarbamates



United States Patent This invention relates to novel and useful aryl bl-substituted thionocarbamates. This is a continuation-m-part application of the application filed on May 23, 1962, Ser. No. 196,890, now abandoned.

The novel aryl N-su'bstituted thionocanbamates of this invention have the following general formula:

Ar IITCO-Ari CH2 S wherein Ar is l-na-phthyl, phenyl, tolyl, halophenyl, CF phenyl or methoxyphenyl, and Ar is Z-naphthyl, tolyl, methoxyphenyl or halophenyl with the proviso that at least one of Ar and Ar is naphthyl.

The compounds of this invention are useful as fungicides for :fungal infections on the human skin.

The compounds of this invention are manufactured by the processes represented vby the following equations:

An-N-C-Cl HO-AH a S In these formulae, Ar and Ari have the same meaning as defined above.

These processes are explained in further detail as follows:

The reactions indicated by the Equations 1 and 2 are successfully carried out by the use of a suitable solvent, such as water, ethanol, methanol, acetone and chloro- "form, and by the use of a dehydrochlorination agent such 'as alkali metal bicarbonates, alkali metal carbonates, alkali metal hydroxides, alkali earth metalhydroxides, 'tertiaryamin'e's and the same amines as the ones used as reagents in the reaction.

The preferable'reaction temperature is between 0 and 100 C., and the reaction time may be between and The reaction product is washed with water and is purified by recrystallization from a suitable organic solvent,

such as acetone, alcohol, benzene, or carbon tetrachloride.

Aryl chlorothionoformates, the starting material of the reaction according to Equation 1, are prepared by the reaction of thiophosgen and the compounds of the group consisting of 2-naphthol, 4-methylphenol, 4-methoxy- 3,334,126 Patented Aug. 1, 1967 ICC phenol, 4-chlorophenol and 4-bromophenol, 4-fiuorophenol and 4-iodophenol in the presence of a dehydrochlorination agent. N-substituted thiocarbamoyl chlorides, the starting material of the reaction according to the Equation 2 are prepared by the reaction of bis(N-substituted thiocarbamoyl) disnlfide and chlorine, and of secondary amine and thiophosgen.

Aryl N-su-bstituted thionocarbamates have been proved by extensive tests in vitro and in vivo to be useful substances which have specific therapeutic activity against micotic infections on the skin (such as trichophytia).

The invention will now 'be more fully described in a number of examples but it should be understood that these are given by way of illustration and not of limitation; many modifications can be made in the details without departing from the spirit of the invention.

Example 1 Cl- NC-O A mixture of 14.2 g. of N-methyl-4-chloroaniline and 8.4 g. of sodium hydrogencarbonate in 100 cc. of water was stirred at 0 to 10 C., and 22.3 g. of finely powdered 2-naphthy1 chlorothionoforrnate was added in small portions thereto. The mixture was stirred at 10-15" C. for 1 hour after completion of the addition, the precipitated crystals were collected by filtration, washed with water and dried. Obtained were 31.0 g. (95% yield) of Z-naphthyl-N-methyl-N-(4 chlorophenyl)thionocarbamate. Recrystallization from ethanol gave colorless needle crystals of M.P. l27-l28 C.

Analysis.Calcd. for C H ClNOS: N=4.28%. Found: N=4.49%.

. Example 2 N-?O Y S A mixture of 4.0 g. of N-inethyl-3-toluidine and 2.8 g. of sodium hydrogencarbonate in 50cc. of acetone was stirred at 0 to 10 C., and 7.4 g. of Z-naphthyl chlorothionoformate was added in small portions thereto and the mixture was heated under reflux for 30' minutes. The cooled mixture was pouredinto ca. 150 cc. of cold water and Z-naphthyl-N-methyl N (3 tolyl)thionocarbamate was obtained as white crystals. Yield, 9.1 g. (90%). Re-

I crystallization from alcohol gave colorless needle crystals,

M.P. 110.5-11 1.5 C

Analysis.Ca1cd. for C H NOS: N=4.56%. Found: N=4.10%.

Example 3 @rr Q- on, s

. A mixture of 15.7 g. of N-methyl-l-naphthyla-mine and 8.4 g. of sodium hydrogen carbonate in cc. of ethanol was stirred at 0 to 10 C., and 20.7 g; of 4-chlorophenyl chlorothio'noformate was added d-ropwise thereinto. After completion of the addition, the reaction mixture was stirred 3 Analysis.Calcd. for C1gH14C1NOS: N=4.28% Found: N=4.21%.

Example 4 Example 5 N-C0 l A mixture of 15.7 g. of N-methyl-l-naphthylamine and 5.3 g. of sodium carbonate in 100 cc. of acetone was cooled to 0 to and 22.3 g. of Z-naphthyl chlorothionoformate was added in small portions thereinto. The mixture was heated under reflux for 30 minutes, cooled and poured into ca. 200 cc. of cold water; obtained were 30.5 g. of 2-naphthyl N-methyl-N-(1-naphthyl)thionocarbamate as white crystals. Recrystallization from a mixture of alcohol and acetone gave colorless needle crystals of M.P. 147 C.

Analysis.Calcd. for C H NOS: N=4.09%. Found:

Example 6 A mixture of 14.4 g. of Z-naphthol, 23.5 g. of N-methyl- N-(1-naphthyl)thiocarbamoyl chloride, 8.4 g. of sodium hydrogencarbonate, and 150 cc. of methyl ethyl ketone was treated according to the procedure of Example 4, then 27.5 g. of 2-naphthyl N-methyl-N-(1-naphthyl)thionocarbamate was obtained. Recrystallization from methyl ethyl ketone gave colorless needle crystals of M.P. 147 C., which was undepressed on admixture with the product in Example 5.

Example 7 A mixture of 4.8 g. of N-methyl-3-fiuoroaniline and 3.4 g. of sodium hydrogen carbonate in 50 cc. of acetone was stirred. To the mixture, 8.6 g. of finely powdered 2-naphthyl chlorothio'noformate was added portion-wise so as to maintain the reaction temperature at 10 to 20 C. After completion of the addition, the mixture was further stirred at 50-55 C. for 15 min., then cooled to room temperature. The cooled mixture was poured into 150 cc. of ice water, the precipitated crystalline material was collected by filtration, washed with water, and dried; obtained were 8.8 g. of 2-naphthyl N-methyl-N-(3-fiuorophenyl)thionocarbamate. Recrystallization from ethanol gave 6.0 g. of colorless needle crystals of M.P. 99- 101 C.

Analysis.Calcd. for C H FNOS: N=4.50%. Found: N=4.30%.

Finely crushed Z-naphthyl chlorothionoformate (19.3 g.) was added under stirring into a mixture of 15.2 g. of N-rnethyl-3-trifiuoromethylaniline, 7.5 g. of sodium hydrogen carbonate and 50 cc. of acetone at a temperature of 10 C. to 20 C. After completion of the addi1 tion, the mixture was boiled under refiux for 15 min., then cooled to room temperature. The cooled mixture was poured into ca. 150 cc. of ice water, the precipitated material was collected by filtration, washed with water and dried. 2-naphthyl N-methyl-N-(3-trifiuoromethylphenyl) thionocarbamate was obtained as brownish white granules. Recrystallization from methanol gave 7.5 g. of refined, 2 naphthyl N methyl N (3 trifiuoromethyl)thionocarbamate as pale yellow needle crystals of M.P. 73- C.

Analysis.-Calcd. for C H F NOS: N=4.16%. Found: 3.88%.

Example 9 A mixture of 8.9 g. of N-methyl-l-naphthylamine, 4.2 g. of sodium hydrogen carbonate and cc. of acetone was stirred at a temperature of 5 to 10 C., to which 14.9 g. of 4-iodophenyl chlorothionoformate was added during five minutes. After completion of the addition, the mixture was further stirred at a temperature of 50 to 55 C. for 15 minutes, then cooled to 10 C. The cooled mixture was poured into ca. 200 cc. of ice water, the precipitated material was collected by filtration, then crushed and washed with water and dried. 19 g. of 4-iodophenyl N- methyl-N-(l-naphthyl)thionocarbamate was obtained as brownish powder of M.P. 156159 C. Recrystallization from a mixture of acetone and alcohol gave 14.9 g. of pure 4-iodophenyl N-methyl-N-(l-naphthyl)thionocarbamate as slightly brown needles of M.P. 1615-1625 C.

Analysis.Calcd. for C H INOS: N=3.34%. Found: N=2.94%.

Other compounds prepared by the process similar to those described in the foregoing examples are listed in Table 1.

TABLE 1 Analysis N (percent) No. Formula M.P. C.) Formula Calcd. Found 1 Q-N-fif-O 131 omHilNos 4.17 4.49

HaC S TABLE 1Cou-flnued Anal stsN ercent No. Formula M.P. 0.) Formula y (p Calcd. Found CH3 2 @If-(fiL-O 109-110 CnHnNOS 4.50 4.42

3 CHgQ-N-JflJ-O 117-113 CmHrINOS 4. 4.3?

F N(fi0 0s- 91 CmHuFNOS 4.50 4.31

Had s a FQN-(fll-O 115-116 CmHuFNOS 4.50 4.43 a S n 01 0 @III-fi-O 118-119 CwHuOlNOS 4.23 4.10

7 cum-@axr-mx-o 9a- 95 CnHuNOaS 4.33 4.46

H30 S V s--.--.- N-c-o-@-o11| 141-142 C10H11NOS 4.50 4.20

107 -108 U10H11NO2S 4.33 3.93

123-124 CISHHFNOS 4.50 4.63

H @431 141-142 omHQBr'Nos 3.76 3.50 (EH3 S to the nitrogen; this difference is essential and not incidental because the British patent states it to be important that the hydrogen atom shown attached to the nitrogen atom should not be substituted by any other group, because tests have shown that substitution of hydrogen atom by alkyl, aryl or aralkyl group has the effect of reducing the bacteriostatic activity of the compounds against Grampositive organisms several hundred-fold.

Contrary thereto extended tests carried out in the studies connected with the present invention proved that compounds which have an hydrogen atom attached to the nitrogen atom are inferior to the methyl-substituted compounds by several orders.

Another distinguishing feature of the British patent as compared to the instant invention is that the British patent shows di-chlorinated phenyl rings where applicants only use mono-chlorinated phenyl rings.

Finally, it should be noted that the British patent does not contemplate using a naphthyl group as a substituent at all.

From the tests made to establish the superiority of the compounds according to the invention, some results will be described hereinbelow. Of the tests, some of which were carried out in vitro and some in vivo, only the latter will be described since they are believed to be of greater importance.

7 In vivo tests:

(a) Materials Test animal: Healthy male albino guinea pigs, weighing 350 to 400 g., were used in this test.

Test fungus: T richophyton men tagrophytes var.

asteroides.

Test chemicals:

Group A NFS-1077=2-naphthyl N-methyl-N-(1-naphthyl)thionocarbamate NFS1027=2-naphthyl N-methyl-N-phenyl thionocarban-late NFS-1312=2-naphthyl N-methyl-N-( 2-toly1)thionocarbamate NFS-l386=2-naphthyl N-methyl-N-(3-tolyl)thionocarbamate NFS-13 :2-naphthyl N-methyl-N-(4-tolyl)thionocarbamate NFS-3499=2-naphthyl N-methyl-N-(2-fluorophenyl) thionocarbamate NFS-5021=2-naphthyl N-methyl-N-(3-fiuorophenyl) thionocarbamate NFS-3481= 2-naphthyl N-methyl-N- (4-fluorophenyl) thionocarbamate NFS1309=2-naphthyl N-methyl-N-(4-chlorophenyl) thionocarbamate NFS-5022=2-naphthyl N-methyl-N-(3-trifiuoromethylphenyl)thionocarbamate NFS-3508 :2-naphthyl N-methyl-N- 4-methoxyphenyl) thionocarbamate NFS-1361=4-methoxyphenyl N-methyl-N-( l-naphthyl) thionocarbamate NFS-1076=4-chlorophenyl N-methyl-N-( l-naphthyl) thionocarbamate NFS1380=4-bromophenyl N-methyl-N-( l-naphthyl) thionocarbamate NFS-5084=4-iodophenyl N-methyl-N-( l-naphthyl) thionocarbamate Group B CF-4l=phenyl 3,4-dichlorophenylthionocarbamate CF42=4-ethylphenyl 3,4-dichlorophenylthionocarbamate CF-43=3 nitrophenyl 3,4 dichlorophenylthionocarbamate The Group A materials are compounds according to this invention; the Group B compounds are among those described in the British and Australian patents.

Each chemical was prepared to 2% solution having the following composition.

Percent (W./w.)

Test chemical 2 Methyl ethyl ketone 35 PPG #2,000 18 Ethyl alcohol Effective rate (Percent):

No. of cured sites by naked eye N0. of sites treated (when external appearance indicated cure) and Curative rate (percent) No. of sites negative to culture N o. of sites treated X100 Curative rate= (when externally cured and culture negative).

(c) Results.

Tests results are summarized in the following table. As shown in the figures of that table, only the compounds of Group A are highly effective on experimentally infected dermatomycosis of guinea pigs without any side action or with slight irritation. All referenced compounds Group B have no therapeutic effect on dermatomycosis, but have severe side action to affected skin.

TABLE 2 Test Chemicals Therapeutic Efiect Code No. Curative Effective Skin irritation Chemical Formula Group rate rate (percent) (percent) NFS1077 III(ITO A 93 (14/15) 100 (15/15) (0/15) CH3 S NFS1027 II I(|?O A 100 (12/12) 100 (12/12) (0/12) CH; S

I NFS-1312 I?-fi-O A 93 (14/15) 100(15/15) =l:(2/15) CH3 S NFS-1386 N-(|?O A 100 (15/15) 100 (15/15) (0/15) NFS-1310 CH.-,III("JO A 100(15/15) 100 (15/15) :l:(1/15) CH: S

TABLE '2--'C0ntlnued Test Chemicals Therapeutic Eflect Code No. 1 Curatlve Effective Skin irritation Chemical Formula Group rate rate (percent) (percent) A 100 1212) 100 1212 012 NFS 34W l (l 7 AH; g

NFS-5021 A 100 (12/12) 100 (12/12) (0/12) NFS-348l A 100 (12/12) 100 (12/12) (0/12) NEE-1309-... A 93 14/15 100 15/15) -(o/15 I CF; A 83 1012) 100 1212) 012 NFS-5022 N(J'O I I l NFS--6508 CHQO-I- N--- f-0 A 100 12 12 100 12 12) 0/12 l/H3 B n NEE-1361"..- A 80 (12/15) 87 (13/15) -(0/15) NEE-1076-.-; A so 12 15 93 (14/15 --d= 2 15) NFS-1380.. A 66 (12/15) 87 (13/16) i-+(5/15) NFS-5084.-.- @z-z-o-Q-r A 100 (12/12 100 (12/12) (0/12) (:1 01 -41 ClQ-NH-fi-O-Q B 0 0 15 0 0/15) +++++(1s/15 01 01 -42 ClQ-NH-LJ-O-QQH: B 0 0 15 0 0 15 15/15 can-4a c1--NH( 1-0- B 0 0/15 0 0 15 15/1a The foregoing disclosure relates only to preferred emin the scope of the invention as set forth in the appended bodiments of the invention which is intended to include all claims. changes and modifications of the examples described with- 75 11 12 What is claimed is: t 8. The compound having the formula 1. A compound of the formula Ar N-COAr; fi

I s ,7 5 v CH3 0 wherein Ar is l-naphthyl, phenyl, tolyl, halophenyl, CF phenyl or methoxyphenyl, and Ar is 2-naphthyl, tolyl,

methoxyphenyl or halophenyl' and'with the proviso that The compound having the formula at least one of Ar and Ar is naphthyl. N C O X 2. The compound having the formula CH3 'CH3 5 f fi CH3 5 wherein X is "halogen.

10. The compound having the formula 3. The compound having the formula I CH3 H CH: S

NCO O (5H 14, Y

a 11. The compound having the formula 4. The compound having the formula ZBr t CH s *l i 2.5 CHa s v j 12. The compound having the formula 5. The compound having the formula wherein X is halogen. v t

6. The compound having the formula No references cited.

The wound havmg the fmmula 9 CHARLES B. PARKER, Primary Examinr.

N(I3O v '5 DELBERT R. PHILLIPS, BERNARD BILLIAN,

Assistant Examiners. 

1. A COMPOUND OF THE FORMULA 